BIEDS SYLVICOLIDAE—SEIUEUS. 259 peregrina of Wilson, as intimated by Bonaparte, since the former is stated to have the upper parts, including the rump, pale blue. This is never the case in the latter species, where the rump is always green. The absence of white bands on the wing shows that it is not S. coerulea of Wilson. The Helinaia brevipennis of Giraud is quite similar, but has a much shorter wing. List of spedmens. Catal. No. Sex. Locality. When collected. Whence obtained. Collected by— Length. Stretch of wings. Wing. 752 9 9 3 3 Carlisle, Pa. do do Cleveland, Ohio Sept. 23, 1842 May 21, 1841 Oct. 10, 1842 S. F. Baird 4.50 4.75 4.83 7.26 7.60 7.75 2.60 412 do 790 do 2.60 7399 Dr Kirtland . . Cairo, Illinois Fort Union, Neb.. April 22, 1842 1843 N. W. University.. S. F. Baird 1879 J. J. Audubon .... Section Sylvicoleae. Bill distinctly notched ; rictal bristles short or small, or wanting. its digit. First quill scarcely shorter than longest. Hind toe short, equal to the lateral; the claw as long as The following genera compose this section: Seiurus.—Legs stout, elongated ; tarsi longer than the skull. Colors olive above ; streaked beneath. Tail feathers unspotted. Legs yellow. Dendroica.—Legs slender ; tarsi scarcely equal to the skull. Bill variable. Colors of body brilliant and varied. Tail feathers always with a white patch on the inner web. Legs usually dusky. SEIURUS, Swainson. Sdurus, Swainson, .^ool. Jour. Ill, 1827, 171. (Sufficiently distinct from Sdurus.) Type Motadlla aurocapilla, L. Henicodchla, G-rat, List of Genera, 1840. Ch.—Bill rather sylvicoline, compressed, with a distinct notch. Gonys ascending. Rictal bristles very short. Wings mod¬ erate, about three-quarters of an inch longer than the tail; first quill scarcely shorter than the second. Tail slightly rounded ; feathers acuminate. Tarsi about as long as the skull, considerably exceeding the middle toe. Under tail coverts reaching within about half an inch of the end of the tail. Color above olivaceous ; beneath whitish, thickly streaked on the breast and sides. Wings and tail immaculate. This genus is decidedly sylvicoline in general appearance, although the spots on the breast resemble somewhat those of the thrushes. The three species may be grouped as follows : A. Middle of crown brownish orange, bordered by blackish. No white superciliary streak S. aurocapiUus, B. Crown like the back. A well defined superciliary light stripe. Thickly streaked beneath, including crissum. Ground color and superciliary stripe yellowish. Bill small aS'. noveboracensis. Sparsely streaked beneath ; throat and crissum immaculate. Ground color and superciliary stripe white. Bill very large S, ludovidanus.